Please learn the difference between ‘disinterest’ and ‘uninterest’. They are NOT the same. ‘Disinterest’ means ‘interested but neutral’. It is NOT the opposite of ‘interest’. In theory, a trial judge should be disinterested until the verdict is in. You’d be annoyed if he was uninterested. Uninterested’ means ‘don’t want to know’. The average kid in class in uninterested. Baldo is trying to feign ‘uninterest’ in order to negotiate. If he was disinterested, he could be interested enough to see what somebody else pays but he would not be negotiating.